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Earnings Per Share

Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income by the weighted average number of common shares outstanding plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Dilutive potential common shares include outstanding stock options and stock awards. There are no differences in the numerators of our computations of basic and diluted earnings per share for any period presented. The computation of basic and diluted earnings per share is shown below (in thousands, except per share amounts).


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
Net income	$	27,518	$	20,930	$	43,811	$	31,766


Weighted-average common shares outstanding		72,794		72,280		72,749		72,141
Dilutive effect of stock-based awards		445		487		441		517

Shares used in computing diluted earnings per share		73,239		72,767		73,190		72,658

Basic earnings per share	$	0.38	$	0.29	$	0.60	$	0.44

Diluted earnings per share	$	0.38	$	0.29	$	0.60	$	0.44

There were no options to purchase shares of common stock that were outstanding during the periods indicated above that were excluded from the computation of diluted earnings per share because the option purchase price was greater than the average market price of the common shares during the period.